Improvement in center-lamps



UNrrEn STA'rEs L, lk'rEErr @EEIOEF GEORGE sHERwIN ANDEDMOND EOOPLE, OFBROOKLYN, NEw YORK.

IMPROVEMENT IN CENTER-LAMPS.

Specification forming part of Letters Patent No. 189,065, datedi April3, 1877; application led September 5, 1876.

' 10 all whom it may concern The object of our invention is to constructa lamp globe with projections thereon, on which sliding bearings areformed, said bearings being between two suspended guideways, which admitof the globe being raised and lowered.

The accompanying drawing represents a suspended front elevation ofourimprovement. A is the globe, which is made oi' glass or othersuitable material. On this globe projections are formed, which can bemade ofthe same material that the globe is composed of. Theseprojections can be formed while in the process of molding and casting,or while being blown from the glass-blowers pipe.

This globe is made large enough to fill the space between the guidewaysB B. The guideways, being of smooth and even surface, admit the polishedconcave sliding bearings a a to .slide up and down freely.

The guideways B B are suspended from a support, F, while, at their lowerends, the oilfount and 'holder C is attached. Upon the fount-holder Cthe globe-holder lits and rests. The arms .extending from theglobe-holder embrace the guideways and form a sliding bearing, whichadmits of an upward and downward movement with the globe A. y

These guideways B B can be made square, triangular, round, Snc., with acorresponding bearings in the projecting lugs a a.

The guideways B B can be made of glass, so as to transmit light, or anyother suitable material can be used. Two or more guideways may be usedfor the same purpose. A recess, e e, is formed in one of the guidewaysfor the purpose of allowing the globe to be taken out and replaced whendesired.

The upper shoulder of the recess is above the lug ou bearing a. on theglobe, and the lower one below it. This arrangement allows the globe tobe raised from its seat on the globe-holder until the bearing and recessconnects, after which it may be taken from the remaining portion of thelamp and its fixtures. The screw c is for the purpose ot' closing thepassage across the recess e, and to form a bearing for the globe whilepassing the recess.

Whenever it becomes necessary to remove the,

globe the screw c must be turned back, so as to offer no obstruction tothe lug a.

We are aware that other devices can be ernployed to obtain the sameresult, as will be seen by referring to Figures 2 and`3.

In Fig. 2 the suspension-bars are square, with round rods or tubes b b bsecured to their inner sides. Between these rods b b b the globe Aslides up and down, being kept to its place by means of the concaveslidebearings, which are formed in the globe, as indicated by the dottedlines shown in Fig. 2; also in cross-section, Fig. 3, A being the globe,and K K the concave slide-bearings, which partially inclose the rods bb. Sufficient clearance should be allowed between the rod and glassbearing for expansion.

Figs. 4 and 5 are detached views of one of the suspension-bars B,showing a device for removing the globe as follows: In Fig. 4 the tube bb is shown in section. This tube is in two parts. The lower part b issecured tirmly to the bar B, while the upper portion is pivoted at i, onwhich it swings out at one side,

as shown in Fig. 5. When this tube is in the above position the globecan be placed between the guide-bearings b b b, and lowered to its seaton the globe-holder, after which the swinging tube b is swung to itsplace, and secured by pressing the rod l1. down, so that its lower endwill project into the stationary tube b',

whereby the g'lobe can be moved up and down without falling out.Whenever it becomes necessary to remove the globe the rod lL is raised,the tube b swung to one4 side, and the globe raised until the concavebearing K is freed from the tube b', thus allowing it to be swung to oneside and removed.

What we claim, and desire to secure by Letters Patent, is-

l. A lamp-globe with bearings formed in the material of which the globeis composed,

readily removed and replaced, for the purpose specified.

. GEORGE SHERWIN. p M p EDMOND HOOPLE.

Witnesses:

E. D. PRITGHARD, H. J. DAVIS.

